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Lift cylinder assembly
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Patent number 6,991,407
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Issue date Jan 31, 2006
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DBT GmbH
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Friedrich Wilhelm Dannehl
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E21 - EARTH DRILLING MINING
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Hydraulic shield support frame
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Patent number 5,743,679
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Issue date Apr 28, 1998
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DBT Deutsche Bergbau-Technik GmbH
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Georg Gottschlich
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E21 - EARTH DRILLING MINING
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Mine roof support
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Patent number 5,252,006
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Issue date Oct 12, 1993
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Westfalia Becorit Industrietechnik GmbH
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Lubomir Plevak
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E21 - EARTH DRILLING MINING
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Walking prop for mine tunnels
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Patent number 5,190,414
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Issue date Mar 2, 1993
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Strebtechnik Bochum GmbH & Co.
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Hans-Ferdinand Bemmerl
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E21 - EARTH DRILLING MINING
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Mine roof support assembly
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Patent number 5,100,263
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Issue date Mar 31, 1992
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Meco Mining Equipment Limited
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Brian J. Woodford
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E21 - EARTH DRILLING MINING
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Mine roof supports
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Patent number 5,039,257
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Issue date Aug 13, 1991
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Gullick Dobson Limited
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Tom C. Bithell
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E21 - EARTH DRILLING MINING
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Mine roof support assembly
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Patent number 4,940,363
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Issue date Jul 10, 1990
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Meco Mining Equipment Limited
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Stephen A. Brown
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E21 - EARTH DRILLING MINING
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Excavation roof support
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Patent number 3,990,251
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Issue date Nov 9, 1976
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Klockner-Werke AG
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Karl Heinz Wehner
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E21 - EARTH DRILLING MINING
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Mine roof support
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Patent number 3,961,487
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Issue date Jun 8, 1976
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Bochumer Eisenhutte Heintzmonn, & Co.
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Gunter Blumenthal
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E21 - EARTH DRILLING MINING
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3811288
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Patent number 3,811,288
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Issue date May 21, 1974
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E21 - EARTH DRILLING MINING
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3748861
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Patent number 3,748,861
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Issue date Jul 31, 1973
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E21 - EARTH DRILLING MINING